2 Theory of Operation (continued)

2.12 Fan Control Circuit

Located on NH-SYS-M board (System MCU and Control Circuit)

 

 

+12VS

CM123

G1

 

 

 

 

5VS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RM7

 

 

9

UM8A

 

 

 

 

 

 

10K

 

FAN-C

 

 

 

 

(18)

RM6

 

 

 

1

 

16

FAN-SPEED-C

 

 

 

FANLOCK_C

 

(17)

 

 

 

 

 

 

10K

 

 

 

 

 

 

 

 

 

 

CM136

 

 

 

 

 

 

 

 

 

 

 

 

 

8

 

 

 

 

 

 

 

 

104

 

 

 

G1

 

RM161

5VS

CM124

G1

RM162

G1

 

 

 

 

 

 

 

 

 

 

 

5VS

14

 

+12VS

 

 

UM8E

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(143) FAN_A

1

UM12A 3

 

 

 

 

 

 

 

 

+

4

13

5

12

FAN_SPEED_A

 

FANLOCK_A (19)

FAN_ON

2-

4081

 

UM8D

 

ULN2003A

 

 

 

 

 

ULN2003A

 

 

 

 

 

 

 

7

 

 

 

 

 

 

RM163

 

 

 

 

 

RM164

 

 

5VS

 

 

DM32

 

 

 

 

 

 

 

 

 

G1

 

5VS

 

DM33

 

 

 

 

 

 

 

 

 

 

 

 

 

DM34

 

 

 

 

 

 

 

 

 

 

 

 

 

(48) FANLOCK_B

 

FAN_LOCK_B

 

RM166

 

 

 

 

 

 

5VS

 

 

FAN_LOCK_A

 

 

 

 

 

 

 

 

 

 

 

 

 

RM167

 

 

 

 

 

 

 

RM168

 

 

+12VS

 

 

 

 

 

 

5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

UM8G

 

 

 

 

UM12B 4

 

8

106

11

7

 

 

FAN ON

6 4081

 

UM12C

10

FAN SPEED B

 

 

G1

 

9 4081

 

UM8F

 

ULN2003A

 

 

 

 

CM127

 

 

 

ULN2003A

 

 

 

 

 

 

 

 

 

 

 

 

Located on NH-SYS-P board (Auxiliary Power for System, Detect Circuit for Voltage and Current)

 

+12VS

DP5

CNP16

 

 

 

 

 

1

CP96

RP194

 

2

 

3

 

 

 

G1

 

D

FANLOCK C

G

QP14

FAN SPEED C

 

DP6

 

S

 

 

 

 

G1

Located on NH-SYS-S or NH-SYS-SA board (Driver Circuit for Bypass SCR)

 

 

TOFAN

 

+12VS

 

DSA10

CNSA4

 

 

 

 

 

 

 

1

CSA16

RSA21

 

2

 

3

 

 

 

 

G1

 

G

 

D QSA9

FAN_SPEED_A

 

 

 

 

 

 

S

 

 

 

 

 

 

+12VS

DSA11

CNSA5

 

 

 

 

 

 

 

1

 

CSA17

RSA22

 

2

 

 

3

 

 

 

 

FAN_LOCK_A

G1

 

D

FAN_LOCK_B

 

G

QSA8

 

FAN_SPEED_B

 

 

 

 

S

 

 

 

 

 

G1

G1

(a)Fan C is located at the rear panel of the power module’s input EMI filter. Fan A and Fan B are both located at the heat-sink for bypass SCR.

(b)MCU controls fan C via FAN-C (17).

(c)MCU detects a fan C failure via (18).

(d)When in bypass mode, FAN_A (143) will be high to control fan A; fan B will be off. If fan A experiences a failure, fan B will turn on.

(e)MCU detects a fan A failure via FANLOCK_A (19).

(f)MCU detects a fan B failure via FANLOCK_B (48).

60

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Image 42
Tripp Lite SU60KX manual Fan Control Circuit, Located on NH-SYS-M board System MCU and Control Circuit